Chuck.



No'. 725,346. PATBNTBD APR.14,'1903."

P. F. KRUG.

CHUCK.

APPLlOATION FILED MAY 7, 1898.

NQMODEL. 3 SHEETS-SHEET 1.

"" x x "im /d/ ATTORNEY.-

PATENTED APR. 14, 1903.

P. P. KRUG.

CHUCK.

APPLIOATION FILED MAY 7. 189s.

3 SHEETS-SHEET 2,

H0 MODEL WITNESSES:

PATENTED APR. 14, 1903.

P. P. KRUG.

CHUCK.

APPLIOATION FILED un 7, 189s.

' 3 SHEETS-SHEET 3- I IO MODEL.

INVENTOR vFJFICE.

PHILIP F. KRUG, OF NEW YORK, N. Y.

CHUCK.

SPECIFICATION forming part of Letters Patent No. 725,346, dated April14, 1903. Application filed May 7, 1898. Serial No. 680,016. (No model.)

To all whom it may concern..-

Beit known that I, PHILIP F. KRUG, a citizen of the United States, andaresident of the city of New York, county and Stateof New,

York, have invented certain new and useful Improvements in Chucks, ofwhich the following is a specification.

My invention relates tochucks such as are thereby, to guard againstslack and wear of the jaws and to compensate for the same, and also toconstruct` a split jaw the jaws of which are particularly adapted to beproperly guided inward and outward within a proper casing forming partofthe chuck.

I accomplish these and other useful objects in the manner and by themeans hereinafter described, and set forth moreparticularlyin theclaims. 1

In the accompanying drawings, forming part of this specication, andwherein' corresponding characters of reference refer to correspondingparts, Figure l is a central longitudinal section of a chuck constructedaccording to my invention, the jaws being open; Fig. 2, a cross-sectionalong line 2 2 in Fig. 1; Fig. 3, a top View of the chuck, indicating indotted lines the position of the interior parts when the jawsare closedwhile Fig. 4 is a ground plan of the key for actuating the chuck,showing its position when the jaws are open.

other form of my improved chuck is illustrated, Fig. 5 showing alongitudinal section of the chuck-casing without the jaws; Fig. 6, across-section along line 6 6 in Fig. 5 with split jaws inserted, thechuck being open; Fig. 7, a top view of Fig. 5; Fig. 8, a longi- InFigs. 5 to 9, inclusive1 an-A tudinalsection ofvsuch split jaws, andFig.

9 a cross-section along line 9 9 in Fig. 8. The .chuck illustrated linFigs. 10 and 11 appears appliedtoa lathe,-Fig.,10 being a longitudinalvertical section with the jaws` closed, and Fig-11 a cross-sectionalongline 11 11 in Fig.A 10. Fig. -12 is a longitudinalsection of wheel foroperating the same, and Fig 15 a cross-section along line 15 15 in Fig.14.

Referring rst to Figs. 1 to 4, inclusive, 20 represents the casing of achuck. The same incloses a series of jaws 21 2l, usually three or four,which when forced toward each other are adapted to Iirmly grip and holdan article of proper size inserted between the same. 22 is a secondcasing adapted to slide within casing 20, pins 23 being inserted incontact with both said-casings to `prevent their revolving withreference toeach other. Jaws 21 are adapted to slide inward and outwardwithin proper channels'24 in casing 22. 25 is astud on inner casing 22,and 26 a bushing around the same attached to outer casing and-having itsperforation placed eccentrically with reference to said stud. 27 is akey, circular in` crosssection, fitting over said stud and being adaptedto so engage with said walls of the bushing'as to compel longitudinalmovement of stud 25,and with it of casing 22, along casing 2O when saidkey is being turned one hundred and eighty degrees. 28 is a nutscrew-threaded exteriorly, so as to engage with the end of casing 22 forthe purpose of confining the jaws longitudinally. 29 represents C-shapedsprings `placed in proper grooves in the ends of the jaws for thepurpose of forcing the same outward when the chuck is to be opened.SOVrepresents screwplugs inserted in the walls of casing 2O opposite thecentral portions of the jaws, and 31 braces provided with ends ofsemispherical configurations, so inserted in corresponding recesses insaid screw-plugs and said jaws that when stud or thorn occupies theposition shown in Fig. 3 said braces will occupy radial positionssubstantially at right angles to the outer surfaces of the jaws, wherebyIOO It will be seen that braces 31, in conjunction with casings 20 andjaws 21, form togglejoints, the action of which is very prompt andpositive after their proper adjustment has been obtained by means ofscrew-plugs 30. The ends of braces'31 where they contact withscrew-plugs 30 are made semispherical, as described above, not only forthe purpose of permitting the screwing in and out-of said screw-plugswithout affecting the positions of said braces, but also to avoidbinding of the parts while the chuck is being opened and closed. Afurther important advantage gained by making the ends of braces 31semispherical instead of semicylindrical, as usually done, consists inthe possibility thus offered to let screw-plugs 30 rest directly uponthe outer ends of said braces, thus doing away with the necessity ofemploying an intermediate piece in adjusting said braces by means ofsaid screw-plugs. 32 represents interior screw-thread on casing 22 forattaching the chuck to a lathe.

The construction illustrated in Figs. 5 to 9, inclusive, differs moreparticularly from the one above described with reference to the meansfor opening and closing the chuck, the casing22', which carries thejaws, in this case being revolubly mounted upon casing 20', 33 being astud inserted in casing 22 and permitted to travel within slot 34 incasing 20, whereby the extreme limit of relative revolution of onecasing with reference to the other is fixed and their longitudinaldisplacement prevented. Key 27 is provided forproducing such revolvingmotion. The same fits into a socket 35 on casing 22 and has a cam 3G,constructed like the tooth of a conical wheel, engaging with a properrecess 37 on casing 20'. This form of chuck is particularly adapted tobe used in connection with split jaws, as 38, (illustrated in Figs. 8and 9,) which split jaws are shown here to be provided with the usualtubular shank S and with spring-jaws j, each of which has two parallelsides d, adapted to slide along proper slots in casing 22 as said casingis being revolved with reference to casing 20. The outer surface of jaws7' are recessed, as referred to above, for receiving the ends of braces31. Said braces form toggle-joints with casing 20 and jaws 3S, theyrocking in this case, however, in a plane at right angles to the axis ofthe chuck.

Chucks as illustrated in Figs. 10 and ll are actuated by a forkinglever, as 39, such lever being fulcrumed to the frame 40 of the lathe.41 is an independent split ring let into a groove on outer casing 20 andprovided with two studs with which the prongs 42 of said lever engage inusual manner, so as to permit of opening and closing the chuck while thelathe is revolving. 43 43 are locknuts on screw-plugs 30, and 44 is anut on inner casing 22", serving as an additional guide for casing 20".Braces 3l can be made accessible by detaching nut 44. 21 represents thejaws, 23 pins for confining the casings in contact with each other, and31 braces with semispherical ends inserted between jaws 21 andscrew-plugs 30.

The chuck illustrated in Figs. 12 and 13 may be opened and closed simplyby moving tu be 45,which is attached to inner casing 22X,longitudinally, so as to make said casing slide along outer casing 20X,which carries screwplugs 30X. 21X represents the jaws, 23 pins forconfining casings 20 and 22X in contact with each other, and 31 braceswith semispherical ends inserted between jaws 21 and screw-plugs 30X,while 32X indicates interior j screw-thread on casing 20X.

In the chuck illustrated in Figs. 14 and l5 a hand-wheel 46 is employedto produce relative longitudinal displacement of outer casing 20 andinner casing 22. For such purpose said wheel is provided with a iiange47, resting against a nut 48, screwed to the eXterior surface of casing20 to guard againstits longitudinal displacement and is also providedwith interior screw-thread 49, engaging with corresponding screw-threadon the outer surface of casing 22, whereby when said hand-wheel is beingrevolved braces 31 will be either brought into the tilting positionsshown in Fig. 14 or will be brought into approximately verticalpositions corresponding with a closed condition of the chuck. 21represents the jaws, 23 pins for confining the casings in contact witheach other, and 30 screw-plugs bearing against braces 31.

I do not wish to confine myself to the detail constructions andcombinations herein described, as it will readily be seen that the samemight be varied without departing from the spirit of my invention.

I claim as new and' desire to secure by Letters Patent 1. In a chuck,the combination with acasing of jaws movable with reference thereto,screw-plugs inserted in the casing, and braces interposed between andheld in immediate contact with said screw-plugs and said jaws adapted toform toggle-joints therewith, and provided with contact-surfaces in theform of portions of a sphere.

2. In a chuck, the combination with a casing of screw-plugs inserted inthe saine, jaws movable with reference to said plugs, and bracesinterposed between said screw-plugs and said jaws adapted to-formtoggle-joints therewith and provided with contact-surfaces in the formof portions of a sphere.

3. In a chuck, the combination with a casing of spring-actuated jaws,screw-plugs inserted in the casing and braces interposed between saidscrew-plugs and said jaws and IOO IIO

adapted to form toggle-joints therewith and` provided withcontact-surfaces in the` form of portions of a sphere.

4. In a chuck, the combination with a casing, of a split jaw comprisinga solid shank and jaws having guiding-surfaces adapted to slide alongproper guiding-surfaces in the casing, and braces interposed between'said casing and said jaws and forming toggle-joints 5. In a chuck, thecombination with a casing, of a split jaw comprising a solid shank landjaws having guiding-surfaces adapted to slide along correspondingguiding-surfaces in the casing, braces interposed between said casingand said jaws and forming togglejoints therewith, and means forrevolving the casing with reference to the jaw.

May, 1898.

PHILIP F. KRUG.

Witnesses:

CEAS. L. HORACK, WM. J. PARSONS.

'presence of'two witnesses, this 5th day of 3o

